Where are you located? Several ideas, but some of them are region specific.

For an experimental hunk of spark plug wire, I'd probably be looking for a
junk yard. That would most likely be resistance wire- typical resistance
values are 3-12k per foot. Which may or may not be a problem in your
application.

At work, there's a division of the company the routinely works on high
voltage transmission and distribution equipment. Let me poke around Monday
and I may be able to find you an offcut of something and mail it to you. In
this case, the problem will be finding something small enough - they
routinely work with 1000 mcm (conductor one inch in diameter)

-Denny
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